Take-up roller mechanism in a weaving loom



Dec. 31, 1 MASARU YOSHIDA TAKEUP ROLLER MECHANISM IN A WEAVING LOOM Filed Jan. 11. 1967 Sheet FIG.

MMZMW ii 3 ,1968 MASARU YOSHIDA TAKE-UP ROLLER MECHANISM IN A WEAVING LOOM Filed Jan. 11. 1967 Sheet United States Patent 3,419,050 TAKE-UP ROLLER MECHANISM IN A WEAVING LOOM Masaru Yoshida, Gifu, Japan, assignor to Toyoda Automatic Loom Works, Ltd., Kariya, Aichi Prefecture, Japan Filed Jan. 11, 1967, Ser. No. 608,677 Claims priority, application Japan, July 7, 1966,

1/ 44,462 4 Claims. (Cl. 139-311) ABSTRACT OF THE DISCLOSURE A take-up apparatus for a weaving loom for a take-up roller. The apparatus has a power transmission mechanism for rotating the take-up roller and a cloth tension detecting means for detecting variation in the tension of the cloth being conveyed toward the take-up roller and adjusting means coupled to the brake band around a rotary body in the power transmission mechanism. The action of the adjusting means under the control of the tension detecting means adjusts the braking action of the brake band for stopping the operation of the power transmission mechanism when the tension becomes too large.

A take-up mechanism is a mechanism for winding up the web of cloth woven by a weaving loom upon a take-up roller, the cloth being conveyed under appropriate tension from the breast beam through the surface roller and a plurality of guide rollers toward the take-up roller. Any vari ation of the web tension will frequently cause formation of longitudinal wrinkles or lines in the web of cloth due to difference of tension between its runs of conveyance.

The present invention relates to a new apparatus for taking-up the web of cloth in such a manner that the web of cloth conveyed toward the take-up roller will be maintained under substantially constant tension, regardless of the increasing diameter of the growing take-up roller, so that it is possible to prevent the formation of Wrinkles or lines in the web of cloth being wound upon the take-up roller.

With respect to the conventional take-up roller mechanism in a weaving loom, the formation of longitudinal wrinkles or lines occurs frequently in the Web of cloth, for instance at a point where the web of cloth is transferred from the surface roller to the adjacent guide roller. The web of cloth with such wrinkles or lines pressed between the two rollers proceeds toward the take-up roller, so that such defect remains in the Web of cloth wound upon the take-up roller.

The principal object of the present invention is to provide an improved apparatus for taking-up the web of cloth in such manner that the above mentioned drawback is removed.

Another object of the invention is to provide an improved take-up roller mechanism in which the web of cloth is maintained under predetermined tension also during the rewinding motion of the take-up roller.

In the accompanying drawing:

FIG. 1 is a longitudinal sectional view of a part of the take-up mechanism accordin g to this invention;

FIG. 2 is a sectional side view thereof, the section being taken along line H-II of FIG. 1; and

FIG. 3 is a perspective view of the mechanism shown in FIG. 2.

Referring to FIG. 1, illustrating a take-up roller and a driving mechanism therefor, the take-up roller 1 has a trunnion 2. A stationary shaft 3 is fixed to a frame F of the weaving loom and arranged in line with said trunnion 2. A sun gear 5 having a hub 5' is journ aled on the shaft 3. A gear 6 keyed onto said hub 5' is connected to any source 3,419,050 Patented Dec. 31, 1968 of power to be driven thereby through a gear 7 to transmit rotation to the take-up roller 1. In FIG. 2, a rotatable shaft 23 is adapted to be driven from the source of power through an appropriate mechanism, and it has an arm 24 fixed thereto and carrying a pawl pivotally mounted at 26 and engaged with a ratchet wheel 27. The ratchet wheel 27 and the said gear 7 mes-hing with the gear 6 are rigidly united together and are loosely mounted on said shaft 23. During rotation of the shaft 23 in the direction of the arrow, the pawl 25 is maintained in engagement with the ratchet wheel 27, so that the rotation of the shaft 23 is transmitted to the gear 6 through the gear 7, thereby rotating the gear 5. The rotation of the shaft 23 in the direction opposite to the direction of the arrow is effected at the time of rewinding of the cloth. This operation will be described hereinafter.

A planet carrier disc 8 is journaled on the shaft 3 and it carries pins 91 and 91 for two planetary pinions 9 and 9, respectively, said planetary pinions meshing with the sun gear 5 (FIG. 1). To said disc 8 there is secured a driving disc 10 loosely mounted on the trunnion 2 of the take-up roller 1. The driving disc 10 has a notch 10, with which a projection 11 of a driven member 11 fixed to the take-up roller 1 is in engagement as shown, thereby forming a coupling for transmitting rotation of the planet carrier 8 to the take-up roller 1.

A control disc 12 is journaled on the hub 5' of the sun gear 5, and it has an internal gear 13 meshing with said planetary pinions 9 and 9'. A brake band 14 is wound around the periphery of the control disc 12, one end 14' of which is connected to a pin 29 which is slidable and adjustable along an oblong slot 28 formed in the support frame 4 fixed to the loom frame F. The other end 14" of the band 14 is securely connected to a pin 31 on a control lever 16. This control lever is pivotally mounted at to said support frame 4. An upper projection 16' of the control lever 16 is biased rightwardly by means of a spring 15, so that braking action is applied to the control disc 12.

A detector lever 17 carrying a guide roller 32, is oscillatable around a pivot pin 18, responsive to-the tension of the web of cloth w. The left hand lower arm 17' of said detector lever 17 is biased downwardly by means of a spring 19 and is normally maintained in equilibrium by the tension of the web of cloth w. When the tension of the cloth overcomes the tension of the spring 19, the detector lever 17 is oscillated, and the righthand lower arm 17 will be oscillated in the direction of arrow C, where by the lower end of a bolt 17b depresses the longer arm 16" of said control lever 16, oscillating the latter around the pin 30 in a counterclockwise direction. This results in slackening of the brake band 14. A ratchet wheel 34 is fixed to an axis 33 of the guide roller 32, and a pawl 35 engaging said ratchet wheel 34 is pivotally mounted at on the detecter lever 17. While the cloth is normally pulled in the winding up direction, the ratchet wheel 34 is arrested by said pawl 35. On the other hand, upon rewinding of the cloth said ratchet wheel will be freed from the pawl 35, thereby facilitating the rewinding operation. In FIG. 2, a surface roller 20 is shown which is positively driven; 19 and 21 are guide rollers contacting the surface roller, and 22 is a breast beam.

The gear 6 meshing with the gear 7 is normally rotating in the cloth winding-up direction (direction of arrow A), and accordingly the sun gear 5 rotates in the same direction. When the detecter lever 17 is oscillated in the direction of arrow B by being acted by the action of the spring 19 due to a decrease of the tension of the web of cloth, the control lever 16 will also be oscillated in the clockwise direction, so that the brake band 14 will 'be actuated to apply brake action to the control disc 12. On account of the arrest of the control disc 12, the planet carrier disc 8 will be rotated through the planetary pinions 9 and 9', and the take-up roller 1 will be driven through the coupling 10-11, effecting the required take-up of the web of cloth.

When the tension of the web of cloth reaches a predetermined value upon continued take-up operations, the detecter lever 17 will oscillate in the direction of arrow C because it is acted upon by such increased tension, and the bolt 17b on the righthand arm 17" will depress the leftwardly extending arm 16" of the control lever 16. Thereupon, the brake band 14 will be slackened and the braking action on the control disc 12 will be released, so that the latter together with the planetary pinions 9, 9' and the planet carrier disc 8 will freely rotate, so that the take-up operation will be stopped.

On rewinding the web of cloth for the purpose of dressing the cloth to remove defective portions therein, in the conventional take-up apparatus there has been a difference the amount rewound at the surface roller 21 and the amount unwound from the take-up roller 1 due to the difference of diameters thereof, so that the web of cloth is liable to become slackened. According to the apparatus of the present invention, in contrast with the above, only the surface roller 21 is positively rotated reversely to feed back the cloth, the take-up roller 1 being negatively rotated to follow the feed back effected 'by the surface roller 21. Hence, it is possible according to the present invention to feed the web of cloth back while maintaining the predetermined tension thereof.

It will be noted that on rewinding of the cloth the shaft 23 is rotated in the direction opposite to the direction of the arrow, but that the pawl 25 does not engage with the ratchet wheel 27, so that the reverse rotation of said shaft 23 will not be transmitted to the gear 7. A pawl 39 pivoted at 38 on the support frame 4 is held disengaged from the gear 6 during the normal take-up motion, but during the rewinding operation said pawl 39 serves to prevent the rotation of the gear 6 by being engaged thereby, thereby enabling rewinding of the cloth under the required tension. Any variation of the tension of the Web of cloth which might occur when the operation of the loom is stopped may be automatically absorbed by the oscillation of the detecter lever 17.

From the foregoing it will be understood, according to the present invention, that the power transmission system for driving the take-up roller 1 in the normal take-up direction may be occasionally stopped under the control of the detector lever 17 responsive to any variation of the tension of the web of cloth, so that the desired takeup motion may be smoothly continued, maintaining the predetermined tension of the cloth regardless of the gradual increase of diameter of the growing take-up roller, and accordingly that it is possible to prevent any tendency to produce undesired wrinkles or lines caused by difference of tension of the web of cloth between two rollers. It will also be seen that according to this invention the web of cloth may be maintained under predetermined tension even at the time of rewinding the cloth which is necessarily effected for the purpose of dressing the cloth to remove any defective areas.

What I claim is:

1. A take-up apparatus in a Weaving loom having a take-up roller comprising a power transmission mechanism for driving the take-up roller and having a rotary body, a brake band around the body, tension detecting means for detecting variation of the tension of the web of cloth being conveyed toward the take-up roller, and adjusting means coupled to said brake band for adjusting the brake action of said brake band under the control of said tension detecting means for stopping the operation of said power transmission mechanism when the tension detected becomes too large.

2. In a weaving loom having a take-up roller for a Web of cloth, a take-up apparatus comprising a power transmission mechanism for rotating said take-up roller, a cloth tension detecting lever carrying a guide roller at its upper end adapted to be contacted by the web of cloth and oscillated according to variation of the tension of the cloth conveyed toward said take-up roller over said guide roller, said power transmission mechanism having a planetary gear mechanism with a control disc having an internal gear forming part of the planetary gearing of said planetary gear mechanism, a brake band wound around the periphery of said control disc, and means for operatively connecting a lower end of said tension detecting lever with said brake band for tightening the brake band when the tension of the web of cloth decreases to apply brake action to said control disc, thereby rotating the take-up roller.

3. A take-up apparatus as claimed in claim 2, wherein said planetary gear mechanism further comprises a stationary shaft, a sun gear loosely mounted on said stationary shaft, the control disc being journalled on the hub of said sun gear, planetary pinions meshing with said internal gear and said sun gear, and a planet carrier disc on which said planetary pinions are mounted, and a coupling operatively connecting said carrier disc and the take-up roller.

4. A take-up apparatus as claimed in claim 1 wherein the tension detecting lever carrying a guide roller at its upper end has an arm at its lower end, and said apparatus further comprises a control lever to which one end of the brake band is connected, said arm being engaged with said control lever for moving said control lever in response to movement of said arm in a reduced tension direction.

References Cited UNITED STATES PATENTS 537,893 4/1895 Kintzing 1393l1 574,326 12/1896 Heindel 139311 2,366,462 l/l945 Sirmay l393 11 X 2,804,760 9/1957 Clentimack 139-311 X FOREIGN PATENTS 41,915 4/1910' Austria. 202,937 4/1959 Austria. 1,440,960 4/1966 France.

269,412 1/l9l4 Germany.

MERVIN STEIN, Primary Examiner.

JAMES KEE CHI, Assistant Examiner. 

